Synthesis, structure and gas permeation of polymerized ionic liquid graft copolymer membranes

Amphiphilic graft copolymers consisting of poly(vinyl chloride) (PVC) main chains and polymerized ionic liquid (PIL) side chains were synthesized via atom transfer radical polymerization (ATRP). Successful synthesis of the graft copolymers was confirmed using 1H nuclear magnetic resonance (1H NMR),...

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Bibliographic Details
Published in:Journal of membrane science 2013-09, Vol.443, p.54-61
Main Authors: Chi, Won Seok, Hong, Seong Uk, Jung, Bumsuk, Kang, Sang Wook, Kang, Yong Soo, Kim, Jong Hak
Format: Article
Language:English
Subjects:
Applied sciences
artificial membranes
Atom transfer radical polymerization (ATRP)
Carbon dioxide
Chemistry
CO2
Colloidal state and disperse state
composite polymers
differential scanning calorimetry
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Fourier transform infrared spectroscopy
General and physical chemistry
Graft copolymer
Graft copolymers
hydrophilicity
hydrophobicity
Ionic liquids
mechanical properties
Membrane
Membranes
nuclear magnetic resonance spectroscopy
Permeability
poly(vinyl chloride)
Polymer industry, paints, wood
Polymerization
Polymerized ionic liquid
Polyvinyl chlorides
Selectivity
Technology of polymers
transmission electron microscopy
vinyl chloride
X-radiation
X-ray diffraction
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Summary:Amphiphilic graft copolymers consisting of poly(vinyl chloride) (PVC) main chains and polymerized ionic liquid (PIL) side chains were synthesized via atom transfer radical polymerization (ATRP). Successful synthesis of the graft copolymers was confirmed using 1H nuclear magnetic resonance (1H NMR), Fourier-transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) analysis. Differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) analysis revealed well-defined microphase-separated structures in the hydrophobic PVC and the hydrophilic PIL domains. Thus, the PVC-g-PIL graft copolymer membranes maintained good mechanical properties (i.e. a lower strength and greater elongation than PVC) without losing separation properties, as confirmed by universal tensile machine (UTM) and mixture gas permeation tests of CO2/N2 (50/50) at 35°C. As the content of PIL increased, the CO2 permeability increased with a slight decrease of selectivity. The CO2 permeability of PVC-g-PIL membrane with 65wt% of PIL reached 17.9Barrer at 35°C, which was approximately ten times higher than that of the pristine PVC membrane (1.7Barrer). Upon utilizing a PVC-g-PIL/IL composite with 15wt% IL, the CO2 permeability increased to 137.6Barrer by approximately 7.7-fold with a moderate decrease of selectivity. •Microphase-separated structures were obtained for PVC-g-PIL graft copolymers.•Membrane performance increased with PIL content.•Good mechanical properties were obtained without losing separation properties.•High permselective properties were obtained for free-standing PVC-g-PIL and PVC-g-PIL/IL composite membranes.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2013.04.049